ANTIQUE-RADIO-LAB

Antique Radio Forum for Collectors antique-radio-lab.forumotion.com
 
HomeHome  RegisterRegister  FAQFAQ  SearchSearch  Log inLog in  

Share | 
 

 Hum and Micro-phonics Noise

View previous topic View next topic Go down 
AuthorMessage
MichaelS

avatar

Join date : 2015-06-02

PostSubject: Hum and Micro-phonics Noise   2015-08-21, 9:47 pm

Hello again, friends!

I have finished (I think) my restoration of my 1923 Freed-Eisemann, NR-5, five tube battery set.

When I fire it up with the ARBE III, I find that I have a real problem with micro-phonics in the tubes.  I can thump one and they ring like a bell.  Also crackling sounds like a rock-tumbler.  The other night I was able to pick up one station, but did not hear a call sign, but by the sound of the announcer, he sounded like he was from "up Nawth."

I was happy to get that one station, however the symptoms seem to be getting worse.  I do not have a tube checker or access to one.  Before I shell out the $$$ for a re-tube, I'd like to get you guys input on the matter.  BTW, I do not have a loudspeaker, so I have to use headphones (Trimms) (they have been checked and the connections were tightened up which I found were loose)

_________________
"Filamentary, my Dear Holmes, Filamentary."
"I often talk to myself; No one else will listen, and I am the smartest person I know"
Back to top Go down
FrankB
Moderator
Moderator
avatar

Join date : 2010-11-22

PostSubject: Re: Hum and Micro-phonics Noise   2015-08-22, 7:00 pm

Tap gently on the tubes with a pencil eraser, no harder than you want to get hit on the nose with.
 The microphonic tube will make noise.
 You can also have bad socket or solder connections causing the problem, or even a ground.
Back to top Go down
MichaelS

avatar

Join date : 2015-06-02

PostSubject: Re: Hum and Micro-phonics Noise   2015-08-23, 1:03 am

I have sorted out the problems !  Was worried for nothing.  As soon as I hooked the radio up to a good earth ground and my outside antenna, It came alive!  Too many stations to list, however, I think part of the AM dial frequencies are missing.  I could not pick up anything much above 1050 kilohertz, but I did pick up some Atomic Clock.  There was no recorded voice at the minute tone, just morse code.
 Basically I still have a sensitive tube, and I need to make up some good connection wires with spade lugs on the ends.  I have it hooked up to my ARBE with gator wires and they are a Pain in the bum and always seep to pop off (plus the screws that hold the wires to the proper taps on the ARBE get loose very easy.
Thanks to all for their imput.  Now I can do my happy dance!

_________________
"Filamentary, my Dear Holmes, Filamentary."
"I often talk to myself; No one else will listen, and I am the smartest person I know"
Back to top Go down
 
Hum and Micro-phonics Noise
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» buzzing noise stopped but the pump seems to run continuously
» Gurgling noise after a new Radiator was fitted
» Funny gargling noise in the Boilermate
» Sudden new loud noise!
» My Boiler Mate too is making a very loud hmming noise

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench-
Jump to: